Vulcanizing press for rubber tires



June 26, 1951 uz 2,558,140

VULCANIZING PRESS FOR RUBBER TIRES Filed Dec. 11, 1947 3 Sheets-Sheet 1 3 rwwwtm 7 27172062? hrzgi/i June 26, 1951 KRUZIK VULCANIZING PRESS FOR RUBBER TIRES 3 Sheets-Shea?) 2 Filed Dec. 11, 19 17 June 25, 1951 A. KRUZIK 2,558,140

VULCANIZING PRESS FOR RUBBER TIRES Filed Dc. 11, 1947 Y s Sheets-Shet s Patented June 26, 1951 Arnost Kruzik, Zlin, Czechoslovakia, assignor to Bata, Narodni Podnik, Zlin, Czechoslovakia Application December 11, 1947, Serial No. 791,043 In Czechoslovakia December 14, 1946 This invention relates to a vulcanising press, in which two rubber tyres placed one above the other are vulcanised simultaneously. The output of such a press of a kind known per se is twice as great as that of the presses for vulcanising single rubber tyres, whilst the consumption of driving energy is approximately the same, the T100! space occupied the same and the weight of the press relatively only Slightly greater. In the presses vulcanising moulds are usually employed, which are housed in supporting parts, of which the lower part is fixed and immovable, whilst the middle part and the upper part are capable of being hinged up. In order to enable the tyres to be placed into and removed from the moulds, the upper supporting part must be hinged up independently, after which the middle part is hinged up. When closing the press, the procedure is reversed.

The various constructional forms of the press difier in the manner in which the middle part and the upper part are hinged up and down. It is possible to use, both for the middle part and the upper part, independent motion-imparting mechanisms consisting of crank, lever or cam drives worked by hydraulic or motor power.

Through the use of a pull bar attached with one end to the upper supporting part, the other end of which lifts the middle supporting part, the hinged parts of the press could be controlled by means of a single hydraulic piston. In this construction the upper supporting part swings about the pivotal point through almost 90 and the middle supporting part through almost 45.

The essential feature of the present invention resides in the constructional form of a crank mechanism for a vulcanizing press for simultaneously vulcanising two rubber tyres, which mechanism is provided with curved members. These curved members enable the vulcanising mould to be opened and closed with a minimum swinging motion of the supporting parts, that is to say one of at most 45. The crank mechanism is common to both hinged parts. The crank shaft is driven in the same direction of rotation both when opening and closing the mould.

As compared with hitherto known press constructions above referred to, that according to the present invention has the great advantage of a very simple construction, by means of which the opening and closing of the mould is elfected with a minimum swinging motion of the supporting parts.

The invention will now be more particularly described with reference to a constructional ex- 2 Claims. (CI. 1817 ample illustrated in the accompanying drawings,

"the upper supporting part hinged upwards; and

Figure 3 the same press with the upper and middle supporting parts hinged upwards.

The motor I of the press (Figure 2), which is started for instance by means of a manual switch (not shown), and stopped by automatic switches (not shown), drives the worm 2, which engages in a worm wheel 3, keyed together with a toothed wheel 5 on the shaft 4. The toothed wheel 5 meshes with another toothed wheel 6, which drives the crank shaft 1. This crank shaft 1 supports on its ends cranks 8 with crank pins 9, on which the lower eyes of two pull bars 10 are mounted. The upper eyes of the pull bars engage over pins l2 on the upper supporting part l3 and control the swinging motion of the latter about the pivot pin H. For hingeing the middle supporting part l4 upwards and downwards about the pivot pin [5 both pull bars are provided with curved members l6, which coact with the pins l1 and roller [8 on the middle supporting part. During the to-and-fro and swinging motion of the pull bars the rollers 18 mounted on the pins I! roll on the said curved members and thereby bring about the upward and downward hingeing of the middle supporting part.

One working cycle of the press, which begins with the opening of the press (Figure 1) after the completion of a vulcanising operation and ends with the closing of the press after the placing in position of the rubber tyres to be vulcanised, proceeds as frollows:

After the completion of the vulcanising operation the press is started the electric motor commencing to turn the crank shaft 1. The press begins to open, only the upper supporting part being hinged upwards to start with (Figure 2) and the middle supporting part lagging in accordance with the mode of acceleration imparted by the curved members, so that at the end of the stroke, that is to say, when the cranks have performed a rotation of about both hinged up supporting parts are raised through the same angle a, a1 and are separated from one another by a gap a (Figure 3). The press then is stopped by one of the automatic switches, the vulcanised tyre is removed from the lower supporting part and an unvulcanised tyre is put in in place of it. By means of the manual switch the press is restarted and the two movable supporting parts 3 begin to close down. Through the action of the curved members the middle supporting part is closed more rapidly than the upper part. After the middle supporting part has been brought to bear on the immovable lower part, into which the unvulcanised tyre has already been placed, the press is again stopped by one of the automatic switches, the upper supportingpart still remaining hinged upwards by a sufficient angle for enabling the already vulcanised tyre to be removed from the middle supporting part and re-= placed by an unvulcanised tyre. On the: manual switch being again closed, the press is restarted and the upper supporting part is closed, where-- upon the press is again stopped by one of the automatic switches, the vulcanisation then'pro ceeding as the start of a new cycle. ing cycle of the press is thus ended, the crank shaft having performed arotation through-360.

In order that the hingeing upwards and downwards of the middle supporting part shall take place with acceleration, the curved members are given a suitable form forthis purpose. The

curved path, along which the rollers [8 of thepins H of the middle supporting part roll, is determined empirically.

I claim:

1. In an actuating mechanism for openingand closing-a v-ulcanizing press having a fixed bottom mold member,- an intermediate hinged mold merriher-and a top-hinged mold member iior simultaneouslyvulcanizing two; rubber tires,- the com; bination of a crankshaft journaled in said fixed member, means-for rotating said cgank shaft', a

pair of pitmans reciprocated by said crank shaft and pivoted to said top member for raising said top member and supporting the same in open position and for supporting the same during movement to closed position by said reciprocation, a pair of curved members mounted in the middle of said pitmans, respectively, and a pair of rollers mounted on said intermediate member for coacting with said curved members, respectively, for raising said intermediate member into open position and for supporting the same in such positionand for supporting the same during movement to closed position by said coacting efle'cted'bysaid reciprocation of said pitnians.

2. A mechanism as claimed in claim 1 wherein the-directionof rotation of the crank shaft for raising the members into open position and for supporting the same in open position and for supporting the same during movement into closed position is the same.

ARNO'ST KRUZIK.

REFERENCES CITED The'follo'wing references are of recordin the file. of this patent:

UNITED STATES PATENTS Number Name Date 1,969,217 Haiss Aug. 7,1934 2,028,618 Macbeth Jan. 21, 1936 2,029,060 COZZO Jan. 28, 1936 f'----2 08 977 Iverson et al Jan, 19, 1943 

1. IN AN ACTUATING MECHANISM FOR OPENING AND CLOSING A VULCANIZING PRESS HAVING A FIXED BOTTOM MOLD MEMBER, AN INTERMEDIATE HINGED MOLD MEMBER AND A TOP HINGED MOLD MEMBER, FOR SIMULTANEOUSLY VULCANIZING TWO RUBBER TIRES, THE COMBINATION OF A CRANK SHAFT JOURNALED IN SAID FIXED MEMBER, MEANS FOR ROTATING SAID CRANK SHAFT, A PAIR OF PITMANS RECIPROCATED BY SAID CRANK SHAFT AND PIVOTED TO SAID TOP MEMBER FOR RAISING SAID TOP MEMBER AND SUPPORTING THE SAME IN OPEN POSITION AND FOR SUPPORTING THE SAME DURING MOVEMENT TO CLOSED POSITION BY SAID RECIPOCATION, A PAIR OF CURVED MEMBERS MOUNTED IN THE MIDDLE OF SAID PITMANS, RESPECTIVELY, AND A PAIR OF ROLLERS MOUNTED ON SAID INTERMEDIATE MEMBER FOR COACTING WITH SAID CURVED MEMBERS, RESPECTIVELY, FOR RAISING SAID INTERMEDIATE MEMBER INTO OPEN POSITION AND FOR SUPPORTING THE SAME IN SUCH POSITION AND FOR SUPPORTING THE SAME DURINGG MOVEMENT TO CLOSED POSITION BY SAID COACTING EFFECTED BY SAID RECIPROCATION OF SAID PITMANS. 